Example usage for java.io FileInputStream FileInputStream

Introduction

In this page you can find the example usage for java.io FileInputStream FileInputStream.

Prototype

public FileInputStream(FileDescriptor fdObj)

Source Link

Document

Creates a FileInputStream by using the file descriptor fdObj, which represents an existing connection to an actual file in the file system.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ReadableByteChannel channel = new FileInputStream("infile").getChannel();

    ByteBuffer buf = ByteBuffer.allocateDirect(10);

    int numRead = 0;
    while (numRead >= 0) {
        buf.rewind();/*from  w  w  w. j  a  va 2 s .  c o  m*/

        numRead = channel.read(buf);

        buf.rewind();

        // Read bytes from ByteBuffer; see also
        for (int i = 0; i < numRead; i++) {
            byte b = buf.get();
        }
    }
}

From source file:Main.java

public static void main(String[] args) {
    String srcFile = "test.txt";

    try (PushbackInputStream pis = new PushbackInputStream(new FileInputStream(srcFile))) {
        byte byteData;
        while ((byteData = (byte) pis.read()) != -1) {
            System.out.print((char) byteData);
            pis.unread(byteData);//from w w  w  . j  a  v a 2s  .  co  m
            // Reread the byte we unread
            byteData = (byte) pis.read();
            System.out.print((char) byteData);
        }
    } catch (Exception e2) {
        e2.printStackTrace();
    }
}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    FileInputStream fis = new FileInputStream("test");
    ObjectInputStream ois = new ObjectInputStream(fis);
    Object o = ois.readObject();/*from   w ww  .  ja  va  2s . co m*/
    if (!(o instanceof String)) {
        System.out.println("Unexpected data in file");
        System.exit(-1);
    }
    String data = (String) o;
    System.out.println("Got message " + data);
    o = ois.readObject();
    if (!(o instanceof byte[])) {
        System.out.println("Unexpected data in file");
        System.exit(-1);
    }
    byte origDigest[] = (byte[]) o;
    MessageDigest md = MessageDigest.getInstance("SHA");
    md.update(data.getBytes());
    if (MessageDigest.isEqual(md.digest(), origDigest))
        System.out.println("Message is valid");
    else
        System.out.println("Message was corrupted");
}

From source file:Main.java

public static void main(String[] args) throws IOException {
    InputStream is = new FileInputStream("c:\\test.txt");
    DataInputStream dis = new DataInputStream(is);

    int length = dis.available();

    byte[] buf = new byte[length];

    dis.readFully(buf, 4, 5);//from  w ww. j a va2s.com
    for (byte b : buf) {
        char c = '0';
        if (b != 0) {
            c = (char) b;
        }
        System.out.print(c);
    }

}

From source file:Main.java

public static void main(String[] args) throws Exception {
    FileChannel fc = new FileInputStream("data.txt").getChannel();
    ByteBuffer buff = ByteBuffer.allocate(BSIZE);
    fc.read(buff);// w ww  .j a  va  2s . co m
    buff.flip();
    while (buff.hasRemaining())
        System.out.print((char) buff.get());
}

From source file:ZipReader.java

public static void main(String[] args) throws Exception {
    ZipInputStream zis = null;// w  w  w  . j a va 2s. c  om

    FileInputStream fis = new FileInputStream(args[0]);
    zis = new ZipInputStream(fis);

    ZipEntry ze;

    while ((ze = zis.getNextEntry()) != null)
        System.out.println(ze.getName());
}

From source file:Main.java

public static void main(String[] args) {
    InputStream fileInputStream;//from  w  w w .  ja v  a 2s. com
    try {
        fileInputStream = new FileInputStream("c:/a.txy");
        Runtime runTime = Runtime.getRuntime();
        runTime.getLocalizedInputStream(fileInputStream);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) throws Exception {

    boolean bool = false;

    InputStream inStream = new FileInputStream("c:/test.txt");

    // input stream is converted to buffered input stream
    BufferedInputStream bis = new BufferedInputStream(inStream);

    // returns true if mark() and read() supports
    bool = bis.markSupported();/*from w  w  w .j a v  a 2 s . co  m*/
    System.out.println("Support for mark() and reset() : " + bool);

}

From source file:Main.java

License:asdf

public static void main(String[] args) {
    String dataSourceFile = "asdf.txt";
    try (FileInputStream fin = new FileInputStream(dataSourceFile)) {

        byte byteData;
        while ((byteData = (byte) fin.read()) != -1) {
            System.out.print((char) byteData);
        }//from w  ww.  jav  a 2s .c  om
    } catch (FileNotFoundException e) {
        ;
    } catch (IOException e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {

    FileInputStream is = new FileInputStream("c:/test.txt");
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    BufferedOutputStream bos = new BufferedOutputStream(baos, 200);

}